930 Popular Editions of Station Bulletins of the 

 On the basis of 1,000 plants, the results were as follows: 



1,000 protected plants yield 723 marketable heads 

 1,000 check " " 193 " " 



Gain due to tar-pads. . . 530 



u u 



Value of 530 heads at 8 1 /} cents per head. . . . $44 17 

 Cost of protection 1 40 



Net profit per 1,000 protected plants $42 77 



,, . . . In two of the tests of the first year and in one 



Maggot injury J . . 



unevenly ^ ne secon d year, cabbage-maggot injury was 



distributed. comparatively slight, even on the check rows, 

 although other fields nearby suffered severely from the pest. This 

 restricted distribution of maggot infestation is a factor that must 

 be considered by each grower; for fields adjacent to those badly 

 infested, or even certain areas in infested fields, may be com- 

 paratively free from the insects and therefore need no protection. 

 In testing the utility of the use of the pads it will be well to apply 

 them on alternate rows, leaving the intervening rows as checks, 

 in order that the extent of the infestation and the effectiveness of 

 the pads may be more readily learned. If uninfested areas of 

 considerable size are noted, they should be kept under observation 

 in subsequent years, as soil or other conditions there may regu- 

 larly make these areas practically immune to maggot injury, so 

 that pads need not be applied. 



These tests prove quite plainly and con- 

 clusively that where maggots are abundant ana 

 where conditions are such that the pads can be properly applied, 

 these tarred-paper disks serve as efficient protectors of the cabbage 

 plants. They not only prevent serious injury to practically all 

 the plants, but protect all from the slighter infestation which re- 



